What are you saying? That the OP watch isn't a fake...or that the cal 560 did exist in a SM300?
Anyway, the author of that website should perhaps do a bit more proofreading, and research, before publising
There were no cal. 560 in a SM300 and there were no cal. 562 in a SM300. Those are to early in production. The date movements in the 166024 reference were a cal 563 (US version) or a cal. 565.
And the cal. 560 was not a jewel reduced cal 552. That would be the cal 550.
And the cal 552 was not produced in 1958 (that would be the cal 501), but later. And first used in a SM300 reference 16x.024 (the focus of the site) in 1964.
So pretty much a mixed bag of right and wrong info on the movements in the SM300's (also the serial ranges stated btw ... among others)
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